Are you trying to start a 2021 return? Sorry it's too late. You can finish and file if you already started. To do 2021 now you need to use the Desktop Program or fill in the blank IRS forms for free.
2021 1040
https://www.irs.gov/pub/irs-pdf/f1040.pdf
Instructions
https://www.irs.gov/pub/irs-pdf/i1040gi.pdf
Current year EIC and Tax Tables https://www.irs.gov/pub/irs-pdf/i1040tt.pdf
